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What type of frame is the arp reply unicast or broadcast?
Unicast
What method of transmission does a workstation use to send out an ARP request?
A broadcast to all the nodes on its segment
What method of transmission does a workstation use to send an ARP request?
A broadcast to all the nodes on its segment
What is ARP reply?
It's a response to a broadcast asking for the devices MAC ID. Routers and switches keep a table known as an ARP table which lists all the MAC ID's in the local area network. It will send ARP requests out to all the nodes in it's broadcast domain saying send me your MAC ID's. All the nodes in the network reply back with an ARP reply saying here is my MAC ID.
What is arp operation?
ARP is used to find a MAC (layer-2) address, if you know the IP (layer-3) address.First, a device will search its ARP cache, to see whether it already happens to have the required address. If it doesn't find the address, it will send an ARP request as a broadcast, which basically asks "Who has such-and-such an IP address?" The machine that has the requested IP address will send an ARP reply.
Why is an arp query sent within a broadcast frame?
An ARP query is sent in a broadcast frame because the querying host does not know which adapter address corresponds to the IP address in question. For the response, the sending node knows the adapter address to which the response should be sent, so there is no need to send a broadcast frame (which would have to be processed by all the other nodes on the LAN).
If a device does not know its own IP address can it still use ARP?
No - in order to use ARP it would have to send a broadcast for information with a return address of itself. Since it doesn't have an IP address it cannot do that. Furthermore, without an IP address it couldn't participate on the network.
Why does a network host need to broadcast an ARP request?
A host on a network needs to broadcast an ARP request to advertise its Mac address. The networking world is very chatty in nature and when a new network host is available it immediately broadcasts its Mac address as with a ARP message. Also when a particular network host needs to send a data packet to another network host available in the same LAN whose Mac address is unknown, the first network host sends out a ARP message requesting for the destination network hosts MAC address.
What is gratuitous ARP?
Gratuitous in this case means a request/reply that is not normally needed according to the ARP specification (RFC 826) but could be used in some cases. A gratuitous ARP request is an AddressResolutionProtocol request packet where the source and destination IP are both set to the IP of the machine issuing the packet and the destination MAC is the broadcast address ff:ff:ff:ff:ff:ff. Ordinarily, no reply packet will occur. A gratuitous ARP reply is a reply to which no request has been made.
What is the default amount of time that an entry remains in your ARP cache before being removed?
The default time to keep the ARP table entry is 20 mins...For every 20mins the ARP table will be refreshed. Because, The neighboring device can be out of the network so the ARP table should be updated according to the network states. When the table gets refreshed the content will get erased and when the chance comes to resolve the MAC address to the known IP address the ARP request will be sent in broadcast mode where the reply will be in Unicast mode.
How is ARP reply message different from that of ARP request message?
An ARP request is a broadcast Ethernet packet, that is, a packet sent onto the local physical network that all attached devices will receive. A device sends an ARP request to make the query "what is the MAC address (a.k.a. hardware address, link layer address, etc.) of this IP address (a.k.a Layer 3 address, logical network address, etc.)?" An ARP reply is an unicast Ethernet packet, sent from the device that currently owns the specified IP address, back to the device which sent the ARP request. That is, no other device will receive this packet. The ARP reply answers the requester's question, saying "IP address x.x.x.x is associated with MAC address xx:xx:xx:xx:xx:xx".
What arp table entries are created when a client makes an arp request that cannot be satisfied by data already in the arp?
Dynamic ARP table entries are created whne a client makes an ARP request that cannot be satisfied by data already in the ARP table.
